How to achieve a stylized burning (Wireframe) effect?
Create a Cube or use default object and apply a Wireframe modifier.



with the cube selected go to the Physics properties panel and turn on Smoke. Set the flow type to Flame and Flow Source to Mesh (not particles).



Add another cube around the first one, this will act as the rendered domain object.



Set the volumetrics as follows, be sure to turn on Adaptive Domain to reduce processor load.



Go to the Domain object's material settings and set up the Blender Internal values as follows or look for Cycles nodes instead. If in doubt create another cube then select it and perform a Quick Smoke effect. Then you can use and modify the automatically generated material on your object.



It should look like this:



To change the nature of the flame (but not it's shape), you can change the density of the Domain Object's volume material and the texture blend in the texture properties